the .338 caliber 275 grain which is long discontinued.
I believe Elmer Kieth had a hand in the design of this one or at least requested it. I think he and Vernon Speer were good friends both being from Idaho and in the gun business. Bill Steigers ( Bitterroot Bonded Core Bullets) was also associated with Speer and did some of the load development for the early manuals. If those two were involved then that is a pretty good pedigree. The ones I shot seemed to work as designed but when they went to the single core they didn't seem much better than the Hot Core or a Corelokt at least for the price. I would still use them for any application that I would use a cup and core bullet for but would only buy them if on sale.